Overview:

AMX Combined Devices Only Appear as One Device to Master Code

Problem

The existing program has combined devices.
COMBINE_DEVICES(VTP,TP_1,TP_2)

You need to get a button event from one of the real panels even if you have combined the devices with a virtual panel.  You can see the button event in the diagnostics window in NetLinx Studio.  You have tried to use a regular button event on TP_1 but it doesn't work, why?

Cause

When you combine devices, all the combined devices report ONLY as the primary device in the statement. In your example, all pushes will come in as [VTP,x]. The only exceptions to this are DATA_EVENT/ONLINE: and DATA_EVENT/OFFLINE: sections of your code. If you need to get individual panel information anywhere else in your code, you cannot use a combine command.

Solutions

Options are to replace with stacked events or a device array.

Stack Events

BUTTON_EVENT[TP_1,3]
BUTTON_EVENT[TP_2,3]
{
 IF(BUTTON.INPUT.DEVICE=TP_1)
 { //DO THIS }
 IF(BUTTON.INPUT.DEVICE=TP_2)
 { //DO THAT }
}
 

Device Array

DEFINE_DEVICE 
TP_1 = 128:1:0
TP_2 = 129:1:0

DEFINE_VARIABLE
DEV PNLSET[2]={TP_1,TP_2}

DEFINE_EVENT
BUTTON_EVENT[PNLSET,3]
{
 IF(BUTTON.INPUT.DEVICE=TP_1)
 { //DO THIS }
 IF(BUTTON.INPUT.DEVICE=TP_2)
 { //DO THAT }
}​